Screw press



June 17 1924; I 1,498,208

L. SCHULL SCREW PRESS Original Filed Dec. 11, 1920 E j g 17 56 5 E 4 1 gE O o E g 2 2 JNVENTQR usually effected a fly wheel connected PatentedJune 17, 1924.

AT E'Nr OFFICE. I I

5110 1 511) *SCHULL, OF VIENNA; AUSTRIA.

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Be it known that'L meme) SoiiiiLL, a citizen of the Republic of Austria,and resident of 107 Dres' dn erstrasse XX Vienna, in the Province ofLower Austriaand Republic of Austria, have invented certain new anduseful Improvements in Screw Presses, of which the following is aspecification. I I a This application corresponds to 'that filed by mein Austria on November 17th, 1919 (AA-425349), r V

Screw-presses having a frictional drive an'd'a fiy-whe'e'l connectedwith the moving parts of the pressand which 'acts to store energy areWell-known. It is also welllrnovvn to diininishthe consumption of ener-'in such presses by disengaging the flywheelfifom the "sourceof powerduring the ascent of the "spindle of "the press. In such constructionsthe spindle is raised by a 'fscrew nut rotatably mounted the standard ofthe press and provided therefore with a friction wheel. The downwardmovement or descent of thespindle has been hitherto with the spindle anddriven by means of a friction wheel, While a manually operated brakewaspr'o'vided toprevent the nut from rotation by braking thefriction-Wheel.

I But it was not ipog'sibie to prevent the nut m r a on y such a ra ei'p i y b cause it is practically (impossible to always c m th H ifiLZ'QF-I O 1 .0 t 1111i,

by a manually effected brake' pressure since vthis turning momentfrequently increases extremely d fling the work. The oblject of thisinvention is to produce "a brake pressure to prevent the s'crew-nat rromrepation during the descent of the spindle by suitably y shaping andmounting this screw nut, the brake pressure automatically increasing anddecreasing according to the worki'ie'si'stance;

v tional view of the revelubiy mounted screw- In the acc mpanyingdrawings several embodiments of the invention 'arieijllnstrated. In saiddrawings Fig. 1 is a front view of the pres's partially in "section, Fig2 'is a secnut, and-Fig. 3 section'o'f the oilcup. The screwmut 2whichjis fixedly connected witha Wheel 3 'isrevolnbly mounted in thestandard ofthe press. The upper facetof this wheel serves as frictionalor rubbing surface. j

The fly wheel 7 a seat enneta s t these.

No. 420,073. nemweanecember n, 1923.

the upper end of the spindle 6, having the slide 8 at "its lower end,this slide being guided in the standard 1; h I

On'the standard is provided a projection 9 which contains the bearingsfor the friction bevel wheel 10 and the belt pulley 11.

The friction bevel wheel 10 has two rubbing surfaces, the surface 10being adapted to drive the fly wheel 7, the other surface 12 beingadapted to drive the wheel 3 fixed to the nut '2. I

The shaft 13 of the friction Wheel 10 is I diagonally mounted and may bemoved axially by a lever 1%, so that the friction disc 10 can he engagedalternately with the fly wheel 7 or with the rubbing surface 4.

The lever '14 is connected by means of a link 15 with a'projection 16 ofthe reversing spindle 17, which is vertically mounted on the standard -1and can be turned by the workman in one or the other direction byy meansof a lever 18.

hen the descent of thespind le is to be effected the spindle 17' isturned so that the friction Wheel 10 is pressed against the fly wheel 7by the pressure which the projec tion 19 effects at the end of the shaft'13.

By turning the spindle 17 in the opposite direction, the projection '19or the lever :14

"is moved away from member'13 and the friction wheel 10 slides"downwardly because the spindle is braked so as to prevent its revolutionby'a brake shoe'21 guided axial- 1y on the spindle 17, this brake shoecooperating with a brake pulley 22 mounted on the spindle '6 andprovided with flanges23. 1 V

During that part of the descent of the spindle when it is idle the nut 2is braked so as to prevent it from revolving therewith by pressure ofthe friction disc 10v against the fly wheel 7 transmitted to the disc 3by the spindle 6 and the nut 2, which is mounted with butlittleclearance in the standard 1. The disc 3 is, pressed against the brake'shbe 26 disposed at the projection 27 of the standard 1. Instead ofthis brake device any other type can be used as for instance a manuallyactuated brake.

To automatically prevent the nut from revolving during the blow orstrokev of the press the conical frictional surface is of the nut ispressed against its corresponding conical seat in the standard by theresistance of the, work piece.

It will be understood, that the component of reaction pressing the nutagainst its seat is greater, if the seat is conical than if it is formedwith ahorizontal face and that this reaction increases according to theangle or'inclination' of the conical surface. It is obvious that otherwell-known devices could "be employed as equivalent means for ical seat.

a downwardly 45" securing a firm engagement between the stationary seatand the nut when the nut is pressed upwardly by the reaction on thespindle when the press is operating on the Work." j V r H It isnecessary to prevent the lubricating oil from running down from the ,oilgrooves of the nut between the conical surface/t and the adjacentconical surface of the standard, which may be called its coni- If anoil'is allowed to drip between the conical surface of the nut and itsconical seat, this diminishes their frictional ,gr'ip when theyarepressed together, which is undesirable.

To prevent the oil fromrunning between the conical friction surfacesthenut is provided with a ring-shaped drip cup 28 as shown in Fig. 2. Inthis drip 'cup the oil dropping down along the oil grooves 29 isgathered and thrown by the centrifugal force through the bore 30 and theoil pipes 31 against the wall 32 of the standard; 1.

.From'there it drops out through the cylindrical bore 33 of the neckring 34. In order to prevent the oil from rising out of the drip cup 28to its exterior edge and to the conical frictionsurfaces, an oil dipring 35 overlapping the drip cup 28 (Fig. 3) isused. This'oildip-ring isprovided with and outwardly directed flange 36 from which the ascendedlubricant is thrown back by the centrifugal force into the drip cup 28.Further the portion 37 of the nut 2 may be toothed, in order that thelubricant, ascending on it, is thrown away too by the centrifugal force,before it comes along the bevel face 38 to the fric-' tion surface K.The screw nut 2 is of high pitch. t

When the bevel wheel 10 is in frictional engagement with fly wheel 7 tolower the spindle 6, said wheel 10 is out of engagement with the surface4. i The pressure of the slide 8 against the article to be worked outcauses a reaction on the nut 2.so that its conical surface is pressedagainst its conical seat with sufficientforce to lock the nut 2 andpreventit from revolving. Of

course this reaction on nut 2 is equal to the pressureexerted upon thearticle worked upon, at all times, and is therefore-always during thisthe spindle is raised. conical friction surface, I mean to includesuflicientto prevent the r-evolution of said nut while the press isoperating. While the spindle 6 is descending, and beforethe work isoperated upon, the friction of disc all non-planar surfaces asequivalents.

Without limiting myselfto the exact construction and arrangement ofparts ,herein shown and described, what I claiin, and desire to secureby Letters Patent,.is.: r

1 1. In a spindle press, a threaded spindle, a nut engaging saidspindle, said nut being ..held in a mount adapted to permit therevolution thereof and aslightmovement thereof together with saidspindle inla direction parallel to said spindle, means adapted to engageand holdsaid nut to prevent its revolution when the spindle is movedcby.the reactionv against it when, the, press isjbeing operated, and meansfor. alternatively operating said nut and saidspindle; v -f r I v 2. Ina spindle press, the combination of a bearing, a nut revolubly mountedinsaid bearing and having an upper conical friction surface, acorresponding stationary conical seat located adjacent thereto andadapted to frictionally engage therewith, so that if said nut is pressedupwardly the revolution thereof is opposed by the friction of saidfriction surface and said seat, a threaded spindle passing through saidnut and in engagement therewith, means for alternatively I revolvingsaid spindle and said nut, said bearing having a groove adapted tocontain lubricating material, and means for preventing said lubricatingmaterial from reaching said conical surface. I V 2 3. In a spindlepress, the combination of a bearing, a nut revolubly mounted in saidbearing and having an upperconical friction surface, a correspondingstationary conical seat located adjacent thereto and'adapted tofrictionally engage therewith, so that if said nut is pressed upwardlythe revolution thereof is opposed by the friction of said frictionsurface and said seat, a threaded spindle passing through said nut andin engagement therewith, means for alternatively revolving said spindleand said nut, said bearing having a groove adapted to containlubricating material, and said nut having a retaining groove locatedbelow said conical surface and communicating with said first mentionedgroove, so as to restrain the lubricating material from reaching saidconical surface.

a. In a spindle press, the combination of a bearing, a nut revolublymounted in said bearing and having an upper conical friction surface, acorresponding stationary conical seat located adjacent thereto andadapted to frictionally engage therewith, so that if said nut is pressedupwardly the revolution thereof is opposed by the friction of saidfriction surface and said seat, a threaded spindle passing through saidnut and in engagement therewith, means for alternatively revolving saidspindle and said nut, said bearing having a groove adapted to containlubricating material, and said nut having a retaining groove locatedbelow said conical surface and communicating with said first mentionedgroove, so as to restrain the lubricating material from reaching saidconical surface, and means for leading the lubricating material out 'ofsaid retaining groove.

5. In a spindle press, the combination of a bearing, a nut revolublymounted in said bearing and having an upper conical friction surface, acorresponding stationary conical seat located adjacent thereto andadapted to frictionally engage therewith so that if said nut is pressedupwardly the revolution thereof is opposed by the friction of saidfriction surface and said seat, a threaded spindle passing through saidnut and in engagement therewith, means for alternatii ely revolving saidspindle and said nut, said. bearing having a groove adapted to containlubricating material, and said nut having a retaining groove locatedbelow said conical surface and communicating with said first mentionedgroove, so as to restrain the lubricating material from reaching saidconical surface, said nut having a flange adaptedto close said retaininggroove, said flange having a downwardly and outwardly inclined surface.

Signed at Vienna, Austria, this 16th day I of November, A. D. 1920.

LEOPOLD soHULL.

